Eubnace



May 26, 1931. M, M REQUA 1,806,916

FURNACE Filed March 7, 192,

ATTORNEY Patented May 26, 1931?VV MARK M.' menue, oF SEATTLE, WASHINGTON FRNACE Application aieazmarch v,

This in-ivent-ion;relates-to` a furnace of` that class known as Dutch ovens..

An lobjeet ofy my, invention is tol producey an eflicienti furnace.V of thiscliaracter which ,5 is adapted for use vvith honseholdheaters fory 'i burningi sawdust and other comminuted fue'lssf Another'object of the invention is t'o providefa `wood-.refuse furnace requiringbut lit:- t'le; attention; and supervision., 1 Another object. is :toL provide r a furnace `all parts of Which are readily accessible and arranged to facilitate; their ad]ustnients and removal' fon cleaning;` purposes Y Anotherobject' is topnovide a furnace having a fuel hopper adaptedtoprovide anantomatic feed subject to thecontrol` of a V,dampendeyice whereby. the supply of fuel may jbe regulated asto; quantity, or; stopped at. Will. More specific objects and advantages of; the invention will appear inthefol-lowing` descriptioni i y `The invention consistsfin thelnovel con.- stauctinn,.adaptionand combination of p arts; hereinafter describednandiclaimed'.` l

Initshe accompanying.' dravvingsf Y Figure 1 is r. at front elevationpof al .furnace embodyingzfmy invention, the door being omittedit'mpermit seeing -intothe interior of the; furnace. Fig. 21s .az vertical sectional viewon;line;2.,-2 of :Fig 1; Fig. 3 is a.,sec' tionaleviewtaken substantially onfbroken line vLof F'ig. .2; Fig.` #Lis al perspective view of Vthe-'grateframe; .and Fig. fisaidetail section substantially on1linez5'f5-iofF1gr1; .In said; drawings, the reference numeral V6 represents a-v portion of af householdl heater `of known on suitablel type having; an.- inlet cpeninggas; at 7 Fig 2, which communicates with the rear end of. the combustion chamber 8 the furnace. embodying the `present 1nvention. QSaidlfurnace is constructed .of a` general tubular. form, through the entire.` length; of which@ extends a tunnelelike `cavity of-ivvhich saidzchamber: Seconstitutes itsl rear portion. Side. .Walls-:9,and rooffll ofthe furnace strnctunefare preferably constructed of brick or of an equivalent material and, as shown, iscomposedpoftwo thicknesses or courses, the

192s. semina. 259,709.'

inner course being preferably of fire brick. BetweentheV courses 111. and A112 of the brick Work of the roof is advantageously provided alayer of asbestos, or other heat insulating material, indicated by 12. Heat insulating material may also be employed in the side Walls 9-if desired. f i

In'the frontl portion of t'heroof course111, between the planes vof-v the inner surfaces-91 off the side Walls, is an opening 18 WhichicommunicatesV with `a transversely elongated spout 14 of a fuel feed hopper 15, hereinshoWn aslof a funnel shape.v The major di* ameter ofthe opening ofthe hopper spout 141 is equal to the distance between 'the side surfaces 91` ofthe combustion chamber, or

nearly so, as vindicated'by dotted'lines in Fig. 3; Vthe minor diameter of the-spout opening being relatively short, whereby the fuel from the hopper is caused tobe delivered intothe combustionchamber in a thin columnar formation extending substantially the entire'- vvidth of said chamber.` As showin, the spout 14 is provided in oneofits sides (Fig: 5) with anl opening 16 toaccommodate an Vim-f perforate" plate 17 to serve' as al gate valve Which isA adapted to perform two functions;A

one of' which is to vary the effective opening of the spout for regulating the'volume of'fuelI fed into the combustion chamber, and the other is to close the opening to prevent the delivery of vfuel from the hopper as when cleaning the furnace, when kindling a fire,A

orfor stopping the same.

As shown, the spout 14' is provided at orv i near its' lower end With a horizontal flange inthe natureV of a plate 1S which is set uponl the roof course 111to extend, as indicated by dottedlines 181 in Fig. 3,'into the side Walls 9'of' the furnace structure to` be firmly supportedfthereby. y i

The platefelement 18'of the nozzle member is provided atiits front end With1 anrupturnedl rib'portionV 19 (Fig 2) which fits against aplate 20 vvhichconstitutes the front wall of the tunnel 21, the rear portion thereofaifording thecombustion chamber 8.

y Said frontwall 2O is rigidlyl securedv to the spout member as by means of bolts 22 engaging the rib 19 of the plate elementv18.

Said front wall is provided with an opening 23, in elevation extending from about the plane of the under surface of the roof ll of the combustion chamber down to about the level of the upper surface of the floor 10; and, in width, extending to or outside of the respective planes 91 of the furnace walls 9.

F or this wall opening 23 is provided a swing-able door 24 (omitted from Fig. l) provided near its top with laterally protruding gudgeons 25 engagingin notched lug elements 26 of the front wall 20. Provided in the combustion chamber 3 and extending into the tunnel part 2l is a rectangular frame, or drawer as hereinafter termed, comprising a bottom 27, from the back and side edges of which are upwardly extending walls 28, and 29, respectively.

The side walls 29 of the drawer, preferably, are highest at the front whereat they are connected by a transverse bar 30 in spaced relation above the plane of the bottom 27 to afford below the bar an opening 31 through which ashes may be dumped after the drawer is removed from the furnace.

Said drawer, moreover, serves as the frame member of the furnace grate, said grate having bars 32 of the rocker or shaking type, having at opposite ends trunnions 33 to engage in notches 34@ provided therefor in the sides 29 of the drawer.

For rocking the grate bars 32, the same are provided with depending arms 35, one for each bar, connected (Fig. 2) by pivot pins 36 with an operatingl and' regulating har 37 having rack teeth 38 which are engageable with a stop pin 39 protruding from said drawer, or grate frame.

40 represents a partition disposed ,within the tunnel of the furnace and sets off the combustion chamber 8 from the air cavity adjacent to the door 24. As shown, said partition is hingedly connected at its top by means of studs il engaging in notched lua' elements Ll2 of the front wall 2O and is normally held in the inclined position in which :it is illustrated in Figs. 2 and 3 by a. bolster element i3 of the wall 20, which permits the partition being swung rearwardly and upwardly to give access into the combustion chamber to enable a fire to be kindled therein, and also to be swung clear of the drawer permitting the removal of the latter. The partition, furthermore is provided with draft openings 44 for the admission of air for combustion purposes, the air passingthrough the space between the partition and the door prevents the latter becoming unduly hot.

Air is admitted into the tunnel only when the door 24- is opened to a desired extent. A portionof the air thus admitted enters the chamber 8 from in front through the draft openings 44 in the partition 40, and other portions enter the chamber from below through openings such as slots provided in the respective grate bars and also through openings between the successive bars.

From the foregoing, it is apparent that the draft may be admitted and controlled by opening the door 24, more or less; and regulating the quantity of air admitted through the grate by adjusting the rotary positions of the several grate bars by means of the operating rod 37.

ln operation, fuel is supplied from the hopper 15 by gravitation through the spout 14; into an end of the chamber 8 whereat it commences to burn, and continues as the fuel spreads upon the grate; the lighter burning particles being drawn or carried by the flow of air and gaseous products of combustion toward the iue, or passage 7, whereby substantially all of the combustible particles are consumed before traversing the grate bar assembly.

To clean the grate of ashes etc., the same is deposit-ed in the drawer by rocking the grate bars; and, to remove the ashes from the drawer, the latter is withdrawn from the furnace and dumped from below the grate bars through the opening 3l by suitably tilting the drawer.

The invention and the manner of utilizing the same will, it is thought` be understood from the foregoing description of the illustrated embodiment thereof.

l. A furnace of the character described, comprising a structure having a tunnel extending through its entire length, a door at the front end of the tunnel,` a grate arranged for longitudinal movement in the tunnel, a plate pendantly hinged to the tunnel structure disposed above and at the front end of the grate, said plate being adapted to serve as a partition to divide the tunnel into an air space in front of the partition and a combustion chamber to the rear thereof, a fuel hopper provided with a spout located above the front portion of said combustion chamber, said spout having an elongated delivery aperture arranged transversely of the furnace, and a gate valve provided in saidspout.

2. A. furnace of thel character described, comprising a structurel having a tunnel eX- tending through its entire length, a door'at; the `front end of the tunnel, a gratearranged for longitudinal movement in the tunnel, a plate pendantly hinged to the tunnel structure disposed above and at the front end of the grate, said plate being adapted to serve as a partition to divide the tunnel into an air space in front of the partition and a combastion chamber to the rear thereof, and a fuel hopper provided with a spout located above the front portion of said combustion chamber, said spout having an elongated 'delivery aperture arranged transversely of the furnace. v f

3. A furnace of the character described,

comprising a structure having a tunnelpextending through its entire length, a door at the front end of the tunnel, a/grate arranged for longitudinal movement in the tunnel, a' plate pendantly hinged to the tunnel strueture disposed aloovev and at theV front end of the grate, said plate being adapted to serve l as a partition tovdivde the tunnel into an f air space in front of the partition and a combustion chamber to the rear thereof, and a lo fuel hopper provided with a delivery spout located above the front portion of said combustion chamber. v

Signed at Seattle, Washington, this 23rd day of Februaryl928. v L MARK M. REQUA.- 

